Items Specification Total Acidity% 99.6 Min Ash% 0.1 Max Iron% 0.02 Max Loss on ignition% 0.08 Max Sulfate% 0.1 Max Chloride 20Ppm Max Heavy metal 10Ppm max Purifying agent in pharmaceutical industry, special in antibiotic medication, such as Oxytetracycline , Chloramphenicol , etc; Precipitating agent in Rare-earth mineral processing; Bleaching agent in the textile activities, wood pulp bleaching; Rust-remover for Metal treatment; Grinding agent, such as Marble polishing; Waste water treatment, removing calcium from water.